Formatter inserts newline in attribute-selector value with comma

[hwanders]

This is my test lessText (notice the comma in the attribute-selector's value):

div[data-test='foo,bar']
{
    cursor: default;
}

Calling Less.compile(null, lessText, false) results in the following invalid output:

div[data-size='foo,
bar'] {
    cursor: default;
}